high mercury levels are found in tuna sushi.

excerpt from NYTimes; full article can be found here.

i'm pretty sure everyone in my family, including myself, likes seafood way too much to actually take heed of this, which is reflected in these two paragraphs:

"A number of studies have found high blood mercury levels in people eating a diet rich in seafood. According to a 2007 survey by the New York City Department of Health and Mental Hygiene, the average level of mercury in New Yorkers’ blood is three times higher than the national average. The report found especially high levels among Asian New Yorkers, especially foreign-born Chinese, and people with high incomes. The report noted that Asians tend to eat more seafood, and it speculated that wealthier people favored fish, like swordfish and bluefin tuna, that happen to have higher mercury levels.

The city has warned women who are pregnant or breast-feeding and children not to eat fresh tuna, Chilean sea bass, swordfish, shark, grouper and other kinds of fish it describes as “too high in mercury.” (Cooking fish has no effect on the mercury level.)"